My cat threw up Comfortis flea medicine. Is it still effective?

Yes, as long as he doesn't vomit within 1 hour it should be effective. Always remember to give it with a meal. If he continues to vomit after the 3rd dose of Comfortis, switch your product. Thank you for using Pet Coach.

IF they vomited within an hour of the medication, then the medicine did not digest to work for them. This is the most common side effect of Comfortis and seems to be so often, I have quit recommending it. I have had great success with flea control and no vomiting side effects by using Nexgard for monthly or Bravecto given every 3 months. I would recommend changing products and if redosing them immediately if they vomited under an hour of getting the Comfortis.

This is an overdose, and you may see signs such as vomiting, diarrhea, nausea, and anorexia. Studies show no permanent damage to cats given an overdose, so that's good news. If you do see any of those signs I mentioned above, have B seen by a vet to be safe. I hope this helps!

Comfortis is a great product and should start killing fleas within 30 minutes. If you are still seeing fleas there are a few things to consider. First, make sure you give the Comfortis on a full stomach and make sure the dog keeps it down (sometimes dogs vomit after taking it). There are also probably fleas in the environment/home. I would recommend vacuuming all carpeted areas in your house and washing all of the pet's bedding. Even with the best flea control it can take up to 2-3 months to get the flea problem under control. Make sure you treat all the other pets in the household as well

Six hours is sufficient time for Stella to digest the Trifexis. If you didn't see the pill in the vomitus, then she digested it. Typically, another dose is recommended only if vomiting occurs within 1 hour of administration.

Hi, The truth about expiration dates is that they are usually not based on any studies and the drug is likely to be just as effective years after. I can't say for sure, but it's likely that Comfortis will work. However, the fleas should all be dead within 24 hours, so if you are still seeing live ones jumping around, then it likely didn't work well. You can definitely use the flea collar with Comfortis and this may help to rid her of the remaining fleas. I recommend waiting another week after applying the collar to assess if the treatment worked. If you are still seeing fleas crawling around, then you can try a different flea product like Frontline. Avoid any products that contain ivermectin or any other avermectins for at-least 4 weeks after giving the Comfortis - you can check for this by looking at the active ingredients on the package...any name that ends in "-mectin" should be avoided. I hope that helps and Maggie if flea-free soon.

I'm sorry you're having such a challenging time with Meowsie. It certainly is good of you to treat a feral cat. Crushing Comfortis and mixing it with food shouldn't cause a problem with its absorption, so I doubt that is your problem. If you are still seeing fleas, you might ask your vet for another recommendation, but Comfortis tends to work well. Unfortunately, when a cat has flea allergies or chronic skin problems, it can take a while for the itching to improve even once the fleas have been treated. I might consider giving her a fish oil supplement daily to help improve her skin and decrease her itching. There are a number of fish oil supplements for cats such as Wellactin ( http://www.welactin.com/?pg=cat ). Good luck! I hope that was helpful. Thanks for using PetCoach.